Time-recording device.



TIME RECOREENG DEVICE.

APPLICAHON HLED nma, 1908.

7am my 7 SHEETS SHEET 1.

Patented June 15, 1915 U. M. BROOK.

TIME HECORDHVG DEVICE.

APPLICATION mm DEC.8.1908.

1,143,363. Patented June 15, 1915.

7 SHEETSSHEET 2.

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C. M. CROUK.

TIME RECORDiNG DEVICE.

APPLICATIQN FILEDDEC.S.1908.

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C. M. CROOK.

TIME RECORDING DEVICE.

APPLICATION FILED DEC.8. I908 Patented June 15, 1915.

I SHEETSSHEET 4.

1 w M M w M W W C. M. CROOK- LME RECORDING DEVICE.

C. M. CROOK.

TIME RECORDING DEVICE.

I APPL|CAT|0N FILED Bib-8, 908- 1,143,363. Patented June 15, 1915.

I SHEETSSHEET 6- I 7W? Am C. M. CROOK.

TIME RECORDING DEVICE.

APPLICATION FILED DEC-B, I908. 1,143,363. Patented June 15, 1915.

. 1 SHEETS-SHEET I.

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GHARLES mi. canon; or cmceee'rmmozs, essmiron-fiy mnsm ASSIGNMENTS, "To

. s'moma'mso ELEcrmc-conP -NY;neonrom'rrozq'or -rrniE-nncoeeme m nce.

sp fi n: Letters m ra'tentedi-June 15. 1915;

Application 518a Dece'mher a, senafnbiifcsnse.

T all 11:71am. it'mag concern: l

hi it known that 1, CHARLES CRooK, a citizen of the United States, residing at else, and exact description,reference being had to the accompanying drawing, forming a part of this specification.

This invention relates to improvements in time recording devices, said improvements i being particularlyadaptable to electric time stomps, althonghepplicable also to time recor-zlmgklerices in which means other than elcctronnagnetic force is employed t drive--v these 'wheels are driven in train and locked in train, and arrange. the intermittently actinr motor mechanism to periodically unlock min nllvance the first wheel. Thus'the firs printing wheel normally locksthe printing wheel, the second printing will normally locks the. third and. on, wheel being adapted to unlock the next ceclling wheel one advance the same a single step at the proper-time nml lock the some inmiellietely therenlter.

nioremcnt of zrprinting wheel backward or fmf .\3.r(l by reason of the jerimpnrted to the machine when the head is depressed to make an impression. .lojie has been n troublesome feature of time Stampses heretofore constructed; Intentional rotation of one or more wheels by l-tfiitiltllOl'lZfid persol to change th rcu'llingg is also prevented When it beeonicsnecessary to 1m vthe printing wheels lay hand, as, for instance, to set the "wheels so that they will print the correct tizmn thls mayv lz-e accomplished by the use of a suitable key, a clutch which conne the first printing wheel of the series wi i the motor nleclmnism being uncoupled by the application of the key to the setting shalt illltl tlycrchy pern'iitting the printing .by it may be ascertained fror'niuglnnc" w necessity of first taking such impression d This method of locking and driving also prevents accidental motor mechanism ilinotherobject is to rovide 'a tim w'hlch pri'nts n'pon the upper isi'il paper-or' other article upon 'whic pi' ession he's been mstde, gin- 1 printing and' motor "inechanisinf accessible for the p n ose of inspec repairing the. some. 'lhis' is' aecoinplieli by mounting-the printing and motozimeo nismon 111 arm of its own i of the arm which carries the ces "g for' ft head -'of the machine and ai'rangin'g these two-arms so that they ma be seemed to l the other and thus be made to new together Another object is to providemelinsfwlfe' Wheels to, be "moved independentlyf f the reading of the stampwill'be-fif pression be taken therefr0m, withoiitfthf examining the r -This'nncl such other objec s as are tained by my-linvjention will'iipfieiir following" specification nndethe'accoz'n a y ing di-z yi'ingsfinwhichj Fig-nre'l illustratesan electric-time stamp embodying the features of my inventiong the' f wing thereof being'sliown in-long'itncliniil' section and most of the other parts iii-eleva Fig. 2 is an inverted plain wile-W ofthe v liltingand trnnsfen meeha'nismfF-rg'. 3 is a sectional view-of the riming-and ti nsfer mechanism shown; in Fig."- the section being taken "on. the*'ljin'e"3 of Fig. 2, looking in the; di1;ection*of the arrows; Fig. l is z'a perspectiveWieW= of-9e thenrmatnre and the actuating-lever to which the same is secured and 'Whic'h'=-.is" oscillated when isaicl armature is;attracted lay the motor magnet, the locking and driifing pewL-carried by the leverg and'through which the movement of thejever-=is-tren$ mittecl to the printingfnheels, being else shown in this figure; lligro is alongit'udinal sectionalmicw of the'train of'printing'wheels and the means whereby movement is trans I00 mittecl fronrwheel' to wheel throughlthej" of Fig. 6, looking in the direction indicated by the arrows and illustrating the means for driving the hands of the clock face; Fig. 8 is a sectional view on the line 88 of Figs. 2 and .5, showing the means for manually changing the reading of the month printing wheel; Fig. 9 is a view partly sectional on the line 9-9 of Fig. 3, looking in the direction of the arrows, and-showing part of the printing wheels and transfer mechanism, as well as the mechanism of the clutch which normally connects the train to the driving means, and which uncouples upon the insertion of the setting key to change the reading of those printing wheels which are automatically driven; Fig. 10 shows a section on the line 1Q-10 of Fig. 9, looking in the direction of the arrows; Figs. 11 and 12 show details of the clutch mechanism; Fig. 13

shows the'means whereby'the day printing,

wheel is impositively coupled to, and normally driven by, the preceding printing wheel of the train,.this view being partly sectional on the line"1 3l,3 of Fig. 5, lookingin' the direction of the arrows; Fig. 14 shows asection taken through the machine on the line 141-4 of Fig. 1, looking in the direction of the arrows and, showing the means whereby the head and other parts moving therewith are pivoted to the base; Fig. 15 shows in perspective ,one of the pins which are used to connect the head and other movable parts pivotally to the base; Figs. 16, 17 and 18 show the tens minute printing wheel, hour printing wheel and meridianprinting wheel respectively, and the locking and driving disks associated with or carried by each of said wheels for driving the next succeeding wheel; Fig. 19 is a perspective view of one of the pinions which transmit movement from one printing wheel to the next, and normally look the wheels against movement; and Fig. 20 is a plan view of a plate which carries the electromagnet and to which is secured the printing mechanism, showing the binding screws. and conductor plates which lead to the terminals of the winding of the magnet.

In the several figures, in which like reference numerals indicate the same parts throughout, 1 is the base of the machine, having at one end thereof a receptacle 2 in which is fitted a platen 3, this platen being preferably formed of some slightly resilient material, such as fiber, hard rubber or the like. On this platen will be placed the paper or other article which is to receive the impression of the stamp. The opposite end of the base 1 is provided with a pair of upstanding arms 4, 4, between which is hinged, by pins 5, 5, a movable hollow arm 6, the latter having an enlarged portion 7 forming a head in which is arranged the printing and transfer mechanism. The hollow arm 6 is open along its lower side, having, in cross-sectionalform, substantially the shape of an inverted U. Within the arm is arranged an electromagnet 8 which rests upon and is secured to a bent supporting plate 9. This plate 9 has its shorter portion 10 provided with a pair of lugs 11 which are bent around so as to extend substantially parallel with each other and at right angles with the shorter limb 10 of the plate, as clearly shown in Figs. 1 and 20. These lugs 11, 11 are pivoted in line with the axis of movement of the arm relative to the base, being supported by the pins 5, 5 which connect the base and arm together. The plate 9 and arm 6 are thus made independently movable about the same axis, whereby it is possible, when .the arm and plate are detached from each other, to swing the arm back independent of the printing mechanism and thereby afford access to the latter for purposes of inspection, adjustment and the likes By reference to Fig. 14:, in which the connection between the arm and the base, and between the supporting plate 9 and the base, are clearly shown, it will' be seen that the pivot pins 5, 5 (shown also in Fig. 15) are formed with reduced inner ends 12 which pass into the apertures in the lugs 11 of the plate 9. The pivot pin has a passage extending longitudinally therethrough and is split for part of its length, whereby the inner end may be expanded. An expansion pin 13, having its tip cone-shaped and a portionof its length screw-threaded, is insorted into the pivot pin 5 after the same is in place. The passage through the pivot is of smaller diameter at the inner end of the pin, so that when the expansion pin 13 is screwed into the opening in the pivot pin the inner end of the latter is expanded and caused to fit tightly in the opening in the lug 11. By this means the. pivot pin is prevented from working out and the movable parts are securely but hingedly locked together. The plate 9 is formed with a downwardly bent portion extending along One side of that part of the plate which is forward Jot the magnet, this downwardly bent portion forming a wing or lug 14 which is perforated at two points for the passage of a pair of bars 15 and 16 which extend from one side plate 17 to the other side plate 18 of the stamping mechanism. The stamping mechanism is thus firmly secured to the sup porting plate 9. Other bars 15 and 16 similarly extend from side to side of the stamping mechanism, the side plate 17 being removable after the screws 17 a are taken out. Between the plates 17 and 18 are arranged other plates 19 and 20, the plates 17, 18, 19 and 20 having openings providing bearings for certain of the shafts on which are mounted the gears and other moving parts of the mechanism.

messes ,shaft2l is supported at i'ts-ends in the plates117,and 18 and has secured thereto the actuating le'ver'22 (shown in'perspective in Fig. 51 This lever has secured thereto at its'shorter end an iron plate 23whic'h'constitutesthe armature for the electromagnet 8. "The opposite end of the lever 22 is bent downward and'carries ajpin 24'which extends laterally 'f rom the lever through an level" a locking and driving dog 25.

opening in the side plate 17, as is seen in Fig. I.' On' this pin is arrangeda sleeve 25 which carries at its end farthest from the The i sleeve 25 is free to turn on the pin 24 and carries at its inner end an arm 26 to which I is secured one end of a spring 26", the other end of which is secured to a lug 27 extendin rmmj the side of-t-he lever 22. A shaft I 28 is supported in the side plate 17 and the .springziil which is secured at one end to the pawl and at its opposite end to a stud 31 ing tooth. W

A spring. 32 is secured at one end to a stud 33 projecting from the side plate and at its opposite end toa pin 34 which projects from the side of the lever 22. hen the armature 23 is attracted by theelectromagnet 8, the

lever 22 is swung on the shaft 21 as a fulcrum and the. longer end otthe lever, with the pawl 23 carried thereby, are raised, the

dog25 slipping back over one tooth of the ratchet and en aging with the next succeeden the armature is relieved from the influence of the magnet by the breaking of the circuit, the spring 32 draws the lever down, moving the ratchet wheel around one space and jamming the dog 25* in between the ratchet wheel afid the stud 31, as shown in Fig. 1. The ratchet wheel is thus prevented from turning in either direction when the magnet is denergized, and is prevented -from turning when the armature is energized and the dog" moved over the ratchet wheel by'the other pawl 30.

Turning with the ratchet wheel is a disk 35 (shown by itself in Fig. 11) provided with'ten notches or openings 36 corresponding in number with the teeth of the ratchet into some one of which normally extends a pin 37 projecting from the side of a gear wheel 38, loose on the shaft 28, whereby the rotation of the ratchet is imparted to said gear wheel. This gear wheel 38 meshes -with a. gear wheel 39rwhich=tizrns with the first printing wheel 40, this printing wheel havingits periphery divided into ten spaces bearing the numbers 1 t0 9 and O. The tens minute printing wheel 41, the hour printing wheel 42, the meridian or A; M. a'nd P. M. printing wheel 43 and the day printingwheel 44 are driven from the units minute'printing wheel 40 in such a manner that ea'ch printing wheel locks the next succeeding" printing wheel; in other words the wheels are driven in train and locked in trainee will be hereinafter explained. Furthermor hy having the number of notches on the disk 35 equal to the number 'of teeth on the intermittently rotated ratchet, when the printing-wheels are disconnected from the ratchet fo'r the purpose of setting they will be in synchronism with the. driving mechanism "when again connected. This arrangement, there' fore, provides what mightbe termed a synchronizing or alining clutch between the driving mechanism 'of the stamp and" the printing mechanism. Cllie gear 39, which turns with the units minute pifintingjii'he'el 40, has teeth of considerable width so that the gear 38 may be moved alongonii zs'shaft to disengage the pin 37 carried thereby from the notch. 36 in the disk 35 without-discu gaging the gear 38 from the gear llhen a setting key is inserted to change the printa ing wheels to give a now reading, thotwo parts of the clutch comprising theilisk 35 and the pin 37 are separated so as tou'ncou pie the irinting wheels and. parts moving thcrewiti from themotor mechanism'. 1 The gear 38 has an elongated hub 38 inwhich is fueled a and in this groove ride the ends of a bifurcated lever 45 pivoted at its upper end to a lug on the inneusido ot' the side plate 17. Extending between the 195 members of the lever =15 is a'sotting shait -17 carrying a. gear 48, fast thereon, in mesh with a pinion 4-!) fasten the hub 3 A of the gear 38. This pinion 40 has teetliof considerable width, so that when the'geai" 38 and pinion 49 are moved aloi on'tliesha'ft,

the pinion will remain in mesh with the gear 48 on the setting shaft. The outer end 50;

of the setting shaft 47 is squared to receive a setting key. The side plate 1.7 is provided 115 with a suitable opening having a bushing 51 inserted therein and extending toward the side of the casing of the head and registering with an opening (not shown) therein for the reception of the key. lV-hen the key 120 is inserted in the bushing 51, it encounters the lever45 and the key shaft cannot be turned until this lever has liee'n swung 1nward by the key and thereby moved the gear 38 along on its shaft, thereby withdrawing the pin 37 from thcrecess in which it is resting in the disk When the key is thrust in'tar enough to thus swing the. lever on its pivot and'thereby slide the gear and pinion along on the shaft and uncouple the two parts of the clutch formed by the pin and disk the setting shaft may be turned. Revolving this shaft causes the units minute printing wheel 40 to be revolved, as the gear 48 on the setting shaft remains in mesh with the pinion 49, and the gear 38 which is fast on the hub of the pinion 49 remains in mesh with the gear 39 fast with the printing wheel 40. A spring 52 is coiled about the shaft 28 and is arranged to thrust the movable member of the clutch into engagement with the stationary memher when the setting key is removed.

A clock face 53 and hands 54 and 55 are provided for the purpose of indicating the time that will be printed by the printing wheels. The minute hand 54 is carried by and turns with a shaft-56 which carries fast thereon a gear 57 in mesh with a pinion 57 fast on the setting shaft 47. The hour hand 55 turns with a gear 58 in mesh with a pinion 59 turning with a gear 60 meshing with a pinion 61 fast on the shaft 56. By means of this train of gearing the movement of the hour hand is reduced to afford the proper relative rate of movement between the hour and minute hands.

The shaft 62, on which are arranged the units minute printing wheel 40, the tens minute printing wheel 41, the hour printing wheel 42 and the meridian printing wheel 43, is supported in the side plate 17 and. theplate 19. Arrangcdin line therewith, and supported in the plates 19 and 20, is the .shaft 44 on which issecured the day print-- ing Wheel 44. These wheels 40 to 44 inclusive are all advanced by the motor mechanism.

At each forward movement of the ratchet wheel 29 the gear 38, which is coupled there to by the clutch, is moved forward the proper distance to change the reading of the units minute wheel 40 to the next higher number. Turning with the printing wheel 40 and the gear 39, and preferably made in one piece therewith, is a disk 64 having one notch 64* in its edge. Projecting from the side of the disk 64 are a pair of projections 64 on opposite sides of the notch 64 in the disk. (See Figs. 2, 5 and 10).

Secured on a long counter-shaft 65, supported in the plates 17 and l9,'is a star wheel or pinion (36, shown in perspective in Fig. 19. This star wheel has every alternate tooth cut away for a portion of its width, two of the wide teeth 67 normally resting against the edge of the disk 64-, whereby the star wheel 66 is prevented from rotating. W'hen, however, the units minute printing wheel 40 and the gear 39 and disk 64 have turned to such a position that this printing wheel has printed the digit 9, further rotation will bring the notch 64* in the disk to such a osition as to receive one of the wide teeth 6 of the star wheel, and at the same time one of the projections 64" on the disk will engage another tooth, thereby turning the star wheel, the notch admitting the wide tooth, as seen in Fig. 10, and permitting such rotation.

The tens minute printing wheel 41 has an elongated bearing 68 extending through the bearing of the units minute wheel and carrying at its farther end a gear wheel 69, the units minute wheel by this construction being made to turn on the sleeve which constitutes the long bearing 68 of the tens minute wheel, and being located between the tens minute wheel and the gear 69 which turns therewith. This gear 69 meshes with the pinion or stan wheel 66 and isdriven thereby so that the tens minute wheel is moved forward for a certain distance each time that the units minute wheel revolves and brings the notch in the disk turning therewith around to position to admit a tooth on the star Wheel, as above explained. This tens minute wheel bears the digitsO, 1, 2, 3, 4 and 5 repeated in two series. This wheel, therefore requires two hours to complete a revolution and must therefore move the hour printing wheel 42 forward twice during a complete revolution. The hour printing wheel 42 is normall locked and periodically unlocked and driven forward by a star wheel 70 carried by a counter shaft 71 and meshing with a gear 42 turning with, and preferably formed on, the hour printing wheel 42, the operation of this star wheel 70 in thus locking and driving the hour wheel from the tens minute wheel being similar in all respects to the operation of the units minute wheel in driving and locking the gear 69 and, therefore, the driving and locking of the tensminute wheel to which said gear is secured. In Fig. 16 the tens minute wheel 41 is shown in side elevation, and it will be seen that. there are two notches 41 in the disk 41 and also two pairs of projections 41, as is required by the fact that this wheel must advance the hour wheel twice during a revolution.

The meridian printing wheel 43 has its I periphery divided into twelve spaces hearing the legends A. M. and P. M. alternately. As the hour wheel 42 has its periphery divided into twelve spaces numbered from one to twelve, and therefore makes one complete revolution before it is required that the meridian Wheel be advanced, the locking and driving disk 42 (see Fig. 17) of the hour wheel 42 is provided with but one notch 42? and one pair of projections 42. This looking and driving disk operates upon the meridian printing wheel 43 through a pinion or star wheel 72 supported upon a shaft 73 and meshing with the gear 43 of the meridian wheel 43. lVhen the hour printing Wheel and the minute printing Wheels have printed 11.59, and are about to change the periphery of the disk 95 normally locks the latter and the month printing wheel against movement. By the rotation of the key and shaft the month printing Wheel is turned forward or backward as desired, and the year printing wheel is turned backward or forward one space when the month printing wheel changes its reading from Decemher to January or January to December. It will be seen that the year printing wheel is locked to the month printing wheel and that the month printing wheel is normally locked and cannot be. turned without the use of the setting key.

Pivoted on the pins 5 are two levers 96, 97 having elongated sleeves 98, 99, surrounding the pins, the levers being secured together at their upper ends by a bar 100 extending from one lever to the other, and being secured together at their lower ends by another bar 101. To this bar is secured one end 102 of a retractile spring 103- which extends longitudinally through the base and has its opposite end anchoredto alug 104 on the interior of the casing of the base. The upper ends of these levers bear against the inside of the casing of the arm, the spring 103 thereby tending to raise the head. To normally limit the upward movement of the head a pin 105 is thrust through the base from side to side and just in front of the lower ends of the levers. This pin 105 is so placed that the printing wheels are normally held a short distance from the platen, as seen in Fig. 1, but when it is desired to raise the head to a higher position for the purpose of inspecting the printing wheels, or for any other purpose, the pin may be removed and the head will then rise until the lower ends of the levers engage the curved inner portion 106 of the casing of the base.

Extending through the printing head from side to side and connecting the side plates 17 and 18 together is a cross bar 107 which passes through the head of a bolt 108, the latter extending upward through an opening in the top of the casing f the head and having two nuts 109 an 110 screwed thereupon, whereby the printing head is held up in position in the casing and is made to move therewith. The upper edges of the side plates 17 and 18 rest against shoulders 111 and 112 formed in the thickness of the casing of the head, the head being drawn up to this position by the belt 108. A knob 113, provided with a central opening for the reception of the bolt 108 and nuts 109 and 110 is placed upon the upper side of the casing surrounding the bolt and is held in place by a third nut 114. A slightly resilient cushion 115;, which may be of rubber or the like, is s'ecured upon the knob 113 in position to be struck by the hand when it is desired to arranged therein.

depress the head and thereby print upona paper or other article.

The conductors 116 and 117, which lead,

to the terminals of the winding of the magnet, are usually inclosed together in a sheath 118 and are brought in through an opening 119 in the rear of the casing of the base, the opening having an insulating bushing"120 Secured to the plate 9 is a lug 121 having a channel 122 out across its end and having its exterior threaded to receive a nut 123. The insulated double conductor is laid in the channel in this lug and a clamping plate 124 is laid thereupon, after which the nut 123 is screwed down upon the plate 124 and the conductors are thereby secured against strains which might tend to' tear the same loose from the binding posts 125 and 126. These binding posts are carried upon and suitably insulated from the plate 9 and are connected by means of resilient strips 127 and 128 with the ends of the wire forming the winding of the magnet coil.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is

1. In a time stamp, the combination with a type wheel, of a ratchet, an alining detachable connection between said wheel and said ratchet, and a dog for intermittently operating said ratchet and arranged to lock the same against movement.

2. In a time stamp having an interlocking train of printing wheels, the combination with a ratchet, of an alining detachable clutch between said ratchet and the first printing wheel of the train, and a dog for intermittently operating said ratchet and arranged to lock the same against movement. I

3. In a time stamp, a series of printing wheels geared to be driven in train and each arranged to be normally locked by the preceding wheel in the train and periodically unlocked and advanced, means for driving the first printing wheel ofsaid train and locking the same between driviffg periods, an impositive lock between the last printing wheel in said train and the preceding printing wheel, a counter-shaft and a pinion thereon. meshing with said last printing wheel, said counter-shaft being squared for the reception of a setting key whereby said last printing wheel may be manually turned independently pf the other wheels in the train.

*4. In a time stamp, a plurality of print ing wheels arranged to be driven in train and locked in train, a recessed disk driven in train with said printing wheels and normally locked, another printing wheel carrying a resilient arm arranged to turn therewith and normally to engage said recessed disk, and means for manually turning said last named wheel independently of said disk and the other printing wheels.

5. In a time stamp having an interlock- Ling train of printing wheels, the combination with a clock face, of clock hands geared to one of the train of printing wheels, locking'and driving means for the first of the train of printing wheels, and an alining clutch between said wheel and the locking and driving means, said clutch being arranged to be uncoupled by the insertion of a setting instrument whereby the wheels of the train and said hands may be manually moved together to change the reading thereof at will.

6. In a time stamp, the combination with base, of stamping mechanism pivoted thereto, a housing also pivoted to said base, said stamping mechanism and housing being in dependently movable about a common axis, and means for normally securing said stamping mechanism and said housing to gether.

7. In a time stamp, the combinationwith a base, of a hollow arm open along one of its sides, stamping mechanism, another arm carrying said stamping mechanism, a removable member passing through both of said arms and pivoting said arms to the base, and spring means for raising said arms.

8. In a time stamp, the combination with a pivoted arm, of a casing at the end of said arm, said casing having one side there of open and a stamping head removable through said open side.

9. In a time stamp having an interlocking train of printing wheels, the combination with an intermittently operating motor mechanism connected to, intermittently op erating the first of the'train of printing wheels and locking said wheel against movement except during its operating period, of an alining detachable eoi ction between said motor mechanism and the wheel to permit the revolving of the wheel manually.

10. In a time stamp having an interlocking train of printing wheels, the combination. with an indicating dial having moving members operated synchronously With the printing wheels of the train of the stamp for indicating the movement thereof, of an intermittently operating motor mechanism connected with, intermittently operating the operating synchronously with the printing wheels of the train for indicating the movement of said wheels, of aratchet connected with the first of the printing wheels of the train for operating the same, a dog for in termittently operating said ratchet and arranged to lock the same against movement, an aiming detachable connection between said ratchet and the first wheel of the printing train, means independent of the ratchet for rotating the wheels of the printing train, and means for disconnecting the ratchet from said first wheel when said independent rotating means is operated.

12. In a time stamp having a plurality o rcvoluble printing wheels arranged to print in a straight line and having a gear move-,- ment connecting said Wheels and causing them to operate in train, theicombination with a motor mechanism connected to and intermittently operating the first of the printing wheels of the train, of an alining detachable connect-ion between the motor mechanism and said wheel to permit the wheel to be operated manually.

13. In a time stamp, the combination with a base, of an arm along one of its sides, a stamping mechanism secured to said arm and having its impression device on its under side, said arm being pivoted to said base, means for holding said arm from normally rislng above a predetermined polnt,

and means for disconnecting saidvmeans to permit the arm to be freely swung about on its pivot for inspection and repair.

14. In a time stamp, the combination with a base, of an arm pivoted to said base, stamping mechanism secured to said arm and having its impression devices on its under side, a spring tending to mow; said arm on its pivot to raise the stamping mechanism, stops for preventing said arm from being raised above a predetermined point under the influence of said spring, and means for rendering said sto s ineffective to per mit said arm to swing freely on its pivot.

15. In a time stamp, an arm having a casing atits end, said casing being open at its lower side, stamping mechanism adapted to be inserted into said open side and forming a unitary structure separable from said arm and casing, and means for holding said stamping mechanism in place in said casing. 16. In a time stamp, the combination of a base, a platen carried by said base, lugs extending upwardly from said base, a head comprising an arm having an end bent downwardly at an angle with its body portion and pivoted to said lugs, said arm being pen along its under side, a second arm having an end bent downward and pivoted to said lugs, said second arm being'im sertible into the open side of said first named arm, an electromagnet secured upon the upper side of said second arm, printing wheels in said head, means for moving said printing wheels to change the reading thereof, and an armature disposed to be acted upon by said electromagnet and arranged in mechanical operative connection with said moving means.

17. The combination of a base, a platen carried thereby, a hollow arm made open along its under sideand pivoted at one of its ends to said base, time stamping mech anism in the other end of said arm removable through theiopen side of said arm, a spring tending to raise said arm, and means for normally limiting the upward movement of said arm, said means being removable to permit said arm to be raised to an abnormal position. p

18. In a time stamp, the combination of a memes base having a pair of upstanding lugs at one of its ends, a platen at its opposite end, a hollow arm inserted between said lugs and pivoted thereto, a second arm within said first-named arm, stamping mechanism-carscribed my name in the presence of two witnesses.

CHARLES M. CROOK.

Witnesses:

M. F. FARRAR, CHARLES L. HOPKINS. 

